Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeffef869053a0d1…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 16:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d278613e2d8e272d4f971b53c248a473 SHA-1: bc07f7874ef157625508a719ef25b968ef91dcaf SHA-256: eeffef869053a0d1b02a48bb9a5df95610a75e7fbd12355cac96a89bb8e80c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The embedded URLs and the nature of the heuristics strongly suggest the file's purpose is to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=bacterial+transformation+method+pdf PDF link annotation
    • http://scard.vn/app/webroot/uploads/files/52432027859.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/eca63a6032ecf760f4bf6cebe029c0cf/8879307779.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4q33rbikhlm93i9a8kg51034kp/junus.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/34959518626.pdfIn PDF document text
    • https://j26clean.com/upload/files/3061390944.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/dukami.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a5bdff63---83590092299.pdfIn PDF document text
    • http://capri.lt/userfiles/files/76271539164.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2750e793597f35774dfb03b4a6434d54/14105293210.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ad85f3b57afbc820dc212b4d6e0d6e32/jofejitifekelano.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/kbqeaa2a1n16k5ccntlkc63993/wivamobomujozixanimelera.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7kmf9ned3n8s8d1dv70215jej7/wokek.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/31732397445.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/vawidafimejemagawov.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/14645147755.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bezabibogotatudig.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/47037310258.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/lexesodaramokadolu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/52389872774.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b9665180f2ab818db8080ca6b0b9e508/19191678871.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090be00d87f5---nituruselupeno.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/9880019796.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB771 15716 bytes
SHA-256: eb3f8f0faf0b30718832a1ab816bacfa6d816cc38906f1cfcdcb096d86cce3b1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10940 bytes
SHA-256: 8eb3fdf7d980c623ae26dec579602757b038f65e0787cc268561e5be687ce032
font_02_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1